Activity of Phosphorus Oxide in CaO-MnO-SiO_2-PO_<2.5> (-MgO, Fe_tO) Slags

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著者

    • MOMONO Tadashi
    • Department of Materials Science and Engineering, Muroran Institute of Technology

抄録

The CaO–MnO–SiO<sub>2</sub>–PO<sub>2.5</sub>(–MgO, Fe<sub><I>t</I></sub>O) slags were equilibrated with liquid copper alloys in a molybdenum crucible under a flowing CO<sub>2</sub>/H<sub>2</sub> atmosphere in the temperature range of 1573 to 1673 K.<br> The activity coefficient of PO<sub>2.5</sub>, γ<sub>PO<sub>2.5</sub></sub>, and the phosphate capacity, <I>C</I><sub>PO<sub>4</sub><sup>3-</sup></sub>=(%PO<sub>4</sub><sup>3-</sup>)/<I>P</I><sub>P<sub>2</sub></sub><sup>1/2</sup><I>P</I><sub>O<sub>2</sub></sub><sup>5/4</sup>, of the slags were expressed as follows:<br><br>log γ<sub>PO<sub>2.5</sub></sub> = –2.59 {(%CaO)+0.33(%MnO)+0.55(%MgO)–0.90(%Fe<sub><I>t</I></sub>O)–0.77(%PO<sub>2.5</sub>)}/(%SiO<sub>2</sub>)+1400/<I>T</I>–5.75<br>log <I>C</I><sub>PO<sub>4</sub><sup>3-</sup></sub> = 2.60{(%CaO)+0.33(%MnO)+0.55(%MgO)–0.90(%Fe<sub><I>t</I></sub>O)–0.77(%PO<sub>2.5</sub>)}/(%SiO<sub>2</sub>)+40400/<I>T</I>–6.48<br><br> The phosphorus distributions between hot metal and the slag were examined, based on the thermodynamic data obtained in the present study. From comparison with the plant data, it was concluded that the thermodynamic data obtained in the present study are satisfactorily applicable to the thermodynamic assessment of hot metal pretreatment with high MnO slag.

収録刊行物

  • ISIJ international  

    ISIJ international 38(8), 781-788, 1998-08-15 

    The Iron and Steel Institute of Japan

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